Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20f6b40b9e5ec69…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 22:26:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9f181976e2f438434742a3db1ef9fffb SHA-1: 31680855c7a8bb80fc27a98c60ea007e9cad1dd3 SHA-256: f20f6b40b9e5ec69fec13448fbd4a0a21baae5fe0f796a2b7072c356204e1a2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://inwebjor.ru/uplcv?utm_term=flashes+of+thought+pdf+download PDF link annotation
    • http://tsradviseurs.nl/mailing/images/photo/file/pebiradexazovufatugonad.pdfIn PDF document text
    • http://ranch.pl/files/file/novunewuteroxexatibosena.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f87300a2e5f---80876353550.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/3959872386.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/tafex.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/37836073907.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/bepixuxe.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/ravira.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/15052269275.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/pucv3bj2i3if5oqjbrrljsm3sa/babine.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/mebumonikesakor.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abc3e90354---zumufedesajetimexofu.pdfIn PDF document text
    • http://ancient-theater.gr/media/file/fodudobugiwijoremabedi.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202108281943227261.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/farikapisuxifoburet.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/7su638trrt8j99tj2sj087a7rd/siroja.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf8f6e859---juminatudoxepiliporewoli.pdfIn PDF document text
    • http://qca.ch/userfiles/file/zapakimunopofilujagotix.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/e3f35125147e70a6c6b3d03a1098a50b/jasafojaboxitatimabo.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/4lh89lu6bktlktm7vrfbmjh3po/muroxazafabisavisi.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/ramipeketezimojepajan.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/duxakuvilasunisoxuzafa.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/tavukagalunesarajiz.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/46431194307.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FA 10748 bytes
SHA-256: 8f94f79560d4b25e16e085a3a016438bf0656a738b88a84ec31a58cd9abfee82
font_02_sfnt_off00010b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B88 17088 bytes
SHA-256: da6734ab63379b0b5414840d168bebfd95f14d56fb19d259edf9d856b7d5f824

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